EP0953260B1 - Establishing emergency calls within a mobile telecommunications network - Google Patents

Establishing emergency calls within a mobile telecommunications network Download PDF

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Publication number
EP0953260B1
EP0953260B1 EP98903503A EP98903503A EP0953260B1 EP 0953260 B1 EP0953260 B1 EP 0953260B1 EP 98903503 A EP98903503 A EP 98903503A EP 98903503 A EP98903503 A EP 98903503A EP 0953260 B1 EP0953260 B1 EP 0953260B1
Authority
EP
European Patent Office
Prior art keywords
mobile station
message
call connection
mobile
location
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98903503A
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German (de)
English (en)
French (fr)
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EP0953260A2 (en
Inventor
David Boltz
Vladimir Alperovich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ericsson Inc
Original Assignee
Ericsson Inc
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Filing date
Publication date
Application filed by Ericsson Inc filed Critical Ericsson Inc
Publication of EP0953260A2 publication Critical patent/EP0953260A2/en
Application granted granted Critical
Publication of EP0953260B1 publication Critical patent/EP0953260B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/90—Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/50—Connection management for emergency connections

Definitions

  • the present invention relates to a mobile telecommunications network and, in particular, to informing mobile stations as to prior requested emergency call connections from substantially, the same geographic area.
  • the Emergency Service Bureau provides emergency assistance to persons in need of help.
  • a mobile telephone subscriber for example, seeking emergency service merely has to dial a short unique number (such as 911 in the U.S.) to establish a fast emergency call connection with a Public Safety Answering Point (PSAP) providing the ESB service.
  • PSAP Public Safety Answering Point
  • the PSAP is able to ascertain the approximate location of the mobile station (via cell identity, or global positioning system -GPS, etc.), and provide emergency assistance to the requesting mobile station based on mobile station location.
  • One such system for determining the location of a requesting mobile station is disclosed in U. S. Pat. No.
  • 5,548,583 issued to Bustamante.
  • the system is used to determine the individual location of a telephone handset each time a "911", or emergency call, is initiated.
  • Specially-modified multiple base stations operate jointly to determine the location of the requesting mobile station using signal time-of-arrival information. Every emergency call connection is processed in the same manner, and the system is alerted to the existence of each emergency call.
  • a request for an emergency call connection is received by a mobile switching center (MSC) serving a particular mobile station.
  • MSC mobile switching center
  • the mobile station is informed through an announcement message that an emergency has already been reported within the area of the current mobile station location.
  • the mobile station may then terminate the emergency call connection or remain on-line to be connected to a Public Safety Answering Point (PSAP).
  • PSAP Public Safety Answering Point
  • a request for an emergency call connection is received by a serving MSC from a mobile station traveling within a particular geographic area. Thereafter, all other mobile stations traveling within approximately the same geographic area receive a message indicating that an emergency has been reported. Such a message may be transmitted by use of an unstructured data transmission to the mobile stations over one of the control channels. Mobile subscribers associated with the mobile stations receiving the message are then put on notice that an emergency has already been reported.
  • such announcement messages or unstructured data transmission are communicated only after a threshold number of emergency call connections or attempts have been received from approximately the same geographic area.
  • FIGURE 1 is a block diagram of a telecommunications network 5 illustrating a call connection between a mobile station 10 and a Public Safety Answering Point (PSAP) 20.
  • PSAP Public Safety Answering Point
  • the mobile station 10 originates an emergency call connection towards the PSAP 20 by merely dialing a predetermined short number, such as 9-1-1 in the United States.
  • An over-the-air signal 25 is then received by a base transceiver station (BTS) 30 providing radio coverage for that particular geographic area associated with the requesting mobile station 10.
  • BTS base transceiver station
  • the received signal is then forwarded to an associated mobile switching center (MSC) 40 and visitor location register (VLR) 35 via an interface link 50 connected therebetween.
  • MSC mobile switching center
  • VLR visitor location register
  • the MSC 40 and VLR 35 are often co-located with each other, and are hereinafter collectively referred to as an MSC/VLR.
  • the serving MSC/VLR 40/35 then recognizes that the mobile station is requesting an emergency call connection, and establishes a call connection 60 towards the associated PSAP 20. Once the connection 60 is established, the mobile station 10 may request emergency assistance from or report an emergency situation towards the PSAP 20.
  • STPs signal transfer points
  • SR selective router
  • the PSAP 20 often receives multiple emergency call connections reporting the same incident from a number of different mobile subscribers. Such call connections reporting the same incident tie up valuable trunk connections and/or PSAP terminals, and prevent or delay reporting of a new, and perhaps higher priority, emergency to the PSAP.
  • FIG. 2 illustrating a plurality of coverage areas 110A-110F within a serving mobile switching center (MSC) area 105.
  • the serving MSC/VLR 40/35 provides mobile telecommunications service over a particular geographic area.
  • the MSC coverage area 105 is partitioned into a number of location areas 110A-110F.
  • Each time a mobile station enters a new location area 110 the mobile station performs a location update to inform the MSC/VLR 40/35 and the associated home location register (HLR, not shown in Fig. 2 ) of its new location.
  • Each location area 110 is further partitioned into a number of cell areas 120A-120F.
  • Each cell area is served by a particular base transceiver station (BTS) for effectuating radio communication with mobile stations currently traveling within the respective cell area.
  • BTS base transceiver station
  • an associated BTS serving the appropriate cell area covering the mobile station detects the transmitted signal and forwards the received signal to the serving MSC/VLR 40/35.
  • CI cell identity
  • a mobile station is coupled to a Global Positioning System (GPS) device. Whenever a mobile station originates an emergency call connection, the mobile station may further determine its current GPS coordinates and transmit the determined GPS coordinates to the serving MSC/VLR 40/35.
  • GPS Global Positioning System
  • a number of other terminal locating schemes and systems are widely well known within the mobile telecommunications system.
  • FIGURE 3 is a block diagram of a mobile telecommunications network 5 illustrating a call connection 60 between mobile stations 10 and the PSAP 20 in accordance with the teachings of the present invention.
  • a first mobile station 10A originates an emergency call connection towards the PSAP 20 by dialing the predetermined access number (such as 911 in the U.S.).
  • the transmitted radio signal 25A is first received by the BTS 30 serving the appropriate cell area and forwarded to the serving MSC/VLR 40/35.
  • the serving MSC/VLR 40/35 then instructs an associated switch 220 to establish a call connection 60 between the serving MSC/VLR and the appropriate PSAP 20.
  • a first application module 230 associated with the serving MSC/VLR 40/35 then ascertains the current location of the first mobile station 10A (as described with respect to Figs. 1 & 2 ) and further transmits the determined location data to the PSAP 20.
  • location data may include cell area identities, GPS coordinates, and other well known mobile station location information.
  • the determined location data can be transmitted to the PSAP 20 via a number of different alternatives. If a trunk connection between the MSC/VLR 40/35 and the PSAP 20 comprises a Centralized Automated Message Accounting (CAMA) trunk, location data are transmitted over the CAMA trunk as pseudo Automatic Number Identification (pANI) data. Accordingly, seven or eight digits representing the current location of the mobile station are transmitted from the serving MSC/VLR to the PSAP or ESB as the pANI data within a Call Setup signal.
  • pANI Centralized Automated Message Accounting
  • the emergency service call is made over an Integrated Services Digital Network User Part (ISUP) trunk within a Signaling System No. 7 (SS7) telecommunications network
  • ISUP Integrated Services Digital Network User Part
  • SS7 Signaling System No. 7
  • IAM Initial Address Message
  • the location data can also be transmitted using an application layer signal, such as a Transaction Capability Application Part (TCAP) signal, towards the PSAP 20.
  • TCAP Transaction Capability Application Part
  • a second application module (APPL) 200 associated with the PSAP 20 stores the location data.
  • the second application module (APPL) 200 may further store other information representative of the emergency or incident reported by the first mobile station. Such information may be provided by a PSAP operator after having ascertained the nature of the accident or emergency from a conversation with the reporting subscriber via the first mobile station.
  • a second mobile station 10B located within the same location area as the first mobile station or approximately thereto originates another emergency call connection towards the PSAP 20.
  • the transmitted radio signal 25B is received by the serving BTS 30 and forwarded to the serving MSC/VLR 40/35.
  • the switch 220 is then instructed to effectuate a call connection with the PSAP 20 over the relevant trunk connection.
  • the first application module 230 again ascertains the current location of the second mobile station 10B and transmits the location data to the PSAP 20.
  • the second application module 200 associated with the PSAP 20 then receives the location data representing the second mobile station 10B and determines whether an emergency or accident has already been reported from approximately the same location area. By evaluating the information previously stored for the first mobile station 10A, the application module 200 is able to determine that a reporting has already been received from approximately the same geographic area. The second application module 200 then instructs an associated announcement machine (AM) 210 to provide an announcement message towards the second mobile station 10B. Such a message informs the mobile subscriber that an incident from approximately the same geographic area has already been reported. If available, the announcement message may further include the nature of the reported incident. The mobile subscriber associated with the second mobile station 10B may then choose to remain connected to the PSAP after hearing the played message, hang-up and terminate the call, or interrupt the announcement message and immediately be connected to the next available PSAP operator.
  • AM announcement machine
  • FIG. 4 illustrating the serving MSC/VLR 40/35 providing the announcement message to the second mobile station 10B.
  • An emergency call connection 60 is established for the first mobile station 10A currently traveling within a particular geographic location or area.
  • the first application module 230 associated with the serving MSC/VLR 40/35 determines the current location of the first mobile station 10A and stores the determined location data.
  • the second application module 200 associated with the PSAP 20 may further ascertain the nature of the emergency call connection and provide such information back to the serving MSC/VLR 40/35.
  • Such information may be a predetermined value associated with a pre-recorded message or it may further be a voice recording of a PSAP operator describing the incident.
  • the second mobile station traveling within the serving MSC coverage area requests another emergency call connection towards the PSAP 20.
  • the first application module 230 associated with the serving MSC/VLR 40/35 initially determines whether the second emergency call connection request is coming from approximately the same geographic area as the first mobile station 10A.
  • the application module 230 instructs its associated announcement machine (A.M.) 250 to play an appropriate message informing the second mobile station of the previously reported incident.
  • A.M. announcement machine
  • the second mobile station may listen to the recorded message and terminate the call knowing that the accident or emergency has already been reported, remain on-line and be connected to the next available operator, or even interrupt the announcement message and immediately be connected to the next available PSAP operator.
  • the application module 230 instructs the switch 220 to effectuate a new call connection towards the PSAP 20.
  • Such a message may be generated for a predetermined amount of time (such as 20 minutes after the first reporting of the incident by the first mobile station 10A), or until the PSAP instructs otherwise.
  • FIG. 5 illustrating the mobile telecommunications network 5 transmitting a Short Message Service (SMS) message to mobile stations 10 traveling within a particular geographic area where an emergency has already been reported.
  • SMS Short Message Service
  • the first application module 230 transmits location data associated with the first mobile station 10A to the PSAP 20.
  • the second application module 200 associated with the PSAP then stores the location data.
  • the second application module 200 then transmits unstructured data to all other mobile stations currently traveling within the same geographic area.
  • the second application module 200 may transmit unstructured data indicating that an emergency of a particular nature has been reported within a particular area to all mobile stations currently traveling within a cell area covering that particular area.
  • the second application module 200 associated with the PSAP 20 may transmit a signal instructing the serving MSC/VLR 40/35 to transmit a certain message to all mobile stations currently located within a particular cell area.
  • Messages 250 like a Short Message Service (SMS) message or an Unstructured Supplementary Service Data (USSD) message, can be transmitted over one of the control channels towards all mobile stations 10B-10C currently located within the specified cell area.
  • SMS Short Message Service
  • USSD Unstructured Supplementary Service Data
  • GSM Global System for Mobile
  • the serving MSC/VLR may further translate the received coordinates into a corresponding cell area and appropriately broadcast messages to all mobile stations traveling within the determined cell area.
  • the first application module 230 associated with the serving MSC/VLR 40/35 may similarly monitor emergency calls being generated within its coverage area and generate SMS or USSD messages informing associated mobile stations of the reported incident. Accordingly, the call connection 60 is established between the first mobile station 10A and the PSAP 20. Thereafter, the first application module 230 receives a signal containing description of the reported incident from the PSAP 20. Such a signal comprises an ISUP, TCAP, or any other packet data signals. The first application module 230 then transmits an unstructured data, such as an SMS or USSD message 250, to associated mobile stations 10A-10B currently traveling within the specified geographic area.
  • a threshold value specifying a number of call connections or attempts may further be associated with either the first or the second applications module transmitting the message transporting the unstructured data.
  • the first application module associated with the PSAP 20 does not transmit an SMS or USSD message as described above until a predetermined number of emergency call connections, such as five (5), from the same geographic area have been received. This is to ensure that such broadcasting does not occur until a predetermined level of traffic or reporting has happened within a particular area.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Business, Economics & Management (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Management (AREA)
  • Environmental & Geological Engineering (AREA)
  • Public Health (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Telephonic Communication Services (AREA)
  • Alarm Systems (AREA)
EP98903503A 1997-01-14 1998-01-13 Establishing emergency calls within a mobile telecommunications network Expired - Lifetime EP0953260B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/782,406 US6233445B1 (en) 1997-01-14 1997-01-14 Establishing emergency calls within a mobile telecommunications network
US782406 1997-01-14
PCT/US1998/000753 WO1998031168A2 (en) 1997-01-14 1998-01-13 Establishing emergency calls within a mobile telecommunications network

Publications (2)

Publication Number Publication Date
EP0953260A2 EP0953260A2 (en) 1999-11-03
EP0953260B1 true EP0953260B1 (en) 2008-03-19

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US (1) US6233445B1 (zh)
EP (1) EP0953260B1 (zh)
JP (1) JP2001508967A (zh)
CN (1) CN1105467C (zh)
AU (1) AU746904B2 (zh)
BR (1) BR9806882A (zh)
CA (1) CA2277182C (zh)
DE (1) DE69839258T2 (zh)
TW (1) TW407404B (zh)
WO (1) WO1998031168A2 (zh)

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US11589188B1 (en) 2021-05-27 2023-02-21 T-Mobile Usa, Inc. Device-based timely emergency call routing
US11924713B2 (en) 2021-05-27 2024-03-05 T-Mobile Usa, Inc. Device-based timely emergency call routing

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AU746904B2 (en) 2002-05-02
CA2277182C (en) 2009-07-07
CA2277182A1 (en) 1998-07-16
BR9806882A (pt) 2000-04-18
WO1998031168A2 (en) 1998-07-16
WO1998031168A3 (en) 1998-11-19
CN1105467C (zh) 2003-04-09
DE69839258T2 (de) 2009-04-30
DE69839258D1 (de) 2008-04-30
CN1243645A (zh) 2000-02-02
EP0953260A2 (en) 1999-11-03
AU6025898A (en) 1998-08-03
US6233445B1 (en) 2001-05-15
TW407404B (en) 2000-10-01
JP2001508967A (ja) 2001-07-03

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